While carrying out interplanetary mission by moving spacecraft from outer planet to the inner planet, what is the value of the delta-v?

While carrying out interplanetary mission by moving spacecraft from outer planet to the inner planet, what is the value of the delta-v? Correct Answer Negative

The delta-v required to move the spacecraft from the outer planet to the inner planet is always negative because departure point is at the aphelion and the arrival point is at the perihelion. The speed of the spacecraft has to be reduced in otder to enter a lower- energy transfer orbit.
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A high pressure cylinder consists of a steel tube with inner and outer diameters 30 and 60mm respectively. It is jacketed by an outer steel tube, having an outer diameter of 90mm. Maximum principal stress induced is 80N/mm². Calculate the tangential stress due to shrink shift in inner tube. b) -3.04 c) -3.04 d) +3.04
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